/******************** (C) COPYRIGHT 2009 STMicroelectronics ********************
File Name          : usb_pwr.c
Author             : MCD Application Team
Version            : V3.1.0
Date               : 10/30/2009
Description        : Connection/disconnection & power management

THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/
#include "stm32f10x.h"
#include "usb_lib.h"
#include "usb_conf.h"
#include "usb_pwr.h"
#include "usb.h"

__IO uint32_t bDeviceState = UNCONNECTED; /* USB device status */
__IO bool fSuspendEnabled = TRUE;  /* true when suspend is possible */

struct{
	__IO RESUME_STATE eState;
	__IO uint8_t bESOFcnt;
}ResumeS;
/*******************************************************************************
* Function Name  : PowerOn
* Description    :
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
RESULT PowerOn(void){
	#ifndef STM32F10X_CL
	uint16_t wRegVal;
	// cable plugged-in ?
	cableConfig(ENABLE);
	// CNTR_PWDN = 0
	wRegVal = CNTR_FRES;
	_SetCNTR(wRegVal);
	// CNTR_FRES = 0
	wInterrupt_Mask = 0;
	_SetCNTR(wInterrupt_Mask);
	// Clear pending interrupts
	_SetISTR(0);
	// Set interrupt mask
	wInterrupt_Mask = CNTR_RESETM | CNTR_SUSPM | CNTR_WKUPM;
	_SetCNTR(wInterrupt_Mask);
	#endif /* STM32F10X_CL */
	return USB_SUCCESS;
}
/*******************************************************************************
* Function Name  : PowerOff
* Description    : handles switch-off conditions
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
RESULT PowerOff(){
	#ifndef STM32F10X_CL
	// disable all ints and force USB reset
	_SetCNTR(CNTR_FRES);
	// clear interrupt status register
	_SetISTR(0);
	// Disable the Pull-Up
	cableConfig(DISABLE);
	// switch-off device
	_SetCNTR(CNTR_FRES + CNTR_PDWN);
	#endif // STM32F10X_CL

	// sw variables reset
	// ...
	return USB_SUCCESS;
}
/*******************************************************************************
* Function Name  : Suspend
* Description    : sets suspend mode operating conditions
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
void Suspend(void){
	#ifndef STM32F10X_CL
	uint16_t wCNTR;
	// suspend preparation
	// ...
	// macrocell enters suspend mode
	wCNTR = _GetCNTR();
	wCNTR |= CNTR_FSUSP;
	_SetCNTR(wCNTR);
	#endif // STM32F10X_CL
	//------------------ ONLY WITH BUS-POWERED DEVICES ----------------------
	// power reduction
	// ... on connected devices
	#ifndef STM32F10X_CL
	// force low-power mode in the macrocell
	wCNTR = _GetCNTR();
	wCNTR |= CNTR_LPMODE;
	_SetCNTR(wCNTR);
	#endif // STM32F10X_CL
	// switch-off the clocks
	// ...
	enterLoPower();
}
/*******************************************************************************
* Function Name  : Resume_Init
* Description    : Handles wake-up restoring normal operations
* Input          : None.
* Output         : None.
* Return         : USB_SUCCESS.
*******************************************************************************/
void Resume_Init(void){
	#ifndef STM32F10X_CL
	uint16_t wCNTR;
	#endif // STM32F10X_CL	
	// ------------------ ONLY WITH BUS-POWERED DEVICES ----------------------
	// restart the clocks
	// ...
	#ifndef STM32F10X_CL
	// CNTR_LPMODE = 0
	wCNTR = _GetCNTR();
	wCNTR &= (~CNTR_LPMODE);
	_SetCNTR(wCNTR);
	#endif // STM32F10X_CL
	// restore full power
	// ... on connected devices
	leaveLoPower();
	#ifndef STM32F10X_CL
	// reset FSUSP bit
	_SetCNTR(IMR_MSK);
	#endif // STM32F10X_CL
	// reverse suspend preparation
	// ...
}
/*******************************************************************************
* Function Name  : Resume
* Description    : This is the state machine handling resume operations and
*                 timing sequence. The control is based on the Resume structure
*                 variables and on the ESOF interrupt calling this subroutine
*                 without changing machine state.
* Input          : a state machine value (RESUME_STATE)
*                  RESUME_ESOF doesn't change ResumeS.eState allowing
*                  decrementing of the ESOF counter in different states.
* Output         : None.
* Return         : None.
*******************************************************************************/
void Resume(RESUME_STATE eResumeSetVal){
	#ifndef STM32F10X_CL
	uint16_t wCNTR;
	#endif // STM32F10X_CL
	if (eResumeSetVal != RESUME_ESOF)
	ResumeS.eState = eResumeSetVal;
	switch (ResumeS.eState){
	case RESUME_EXTERNAL:
		Resume_Init();
		ResumeS.eState = RESUME_OFF;
		break;
	case RESUME_INTERNAL:
		Resume_Init();
		ResumeS.eState = RESUME_START;
		break;
	case RESUME_LATER:
		ResumeS.bESOFcnt = 2;
		ResumeS.eState = RESUME_WAIT;
		break;
	case RESUME_WAIT:
		ResumeS.bESOFcnt--;
		if (ResumeS.bESOFcnt == 0)
			ResumeS.eState = RESUME_START;
		break;
	case RESUME_START:
		#ifdef STM32F10X_CL
		OTGD_FS_Dev_SetRemoteWakeup();
		#else
		wCNTR = _GetCNTR();
		wCNTR |= CNTR_RESUME;
		_SetCNTR(wCNTR);
		#endif // STM32F10X_CL
		ResumeS.eState = RESUME_ON;
		ResumeS.bESOFcnt = 10;
		break;
	case RESUME_ON:
		#ifndef STM32F10X_CL
		ResumeS.bESOFcnt--;
		if(ResumeS.bESOFcnt == 0){
		#endif // STM32F10X_CL
			#ifdef STM32F10X_CL
			OTGD_FS_Dev_ResetRemoteWakeup();
			#else
			wCNTR = _GetCNTR();
			wCNTR &= (~CNTR_RESUME);
			_SetCNTR(wCNTR);
			#endif // STM32F10X_CL
			ResumeS.eState = RESUME_OFF;
		#ifndef STM32F10X_CL
		}
		#endif // STM32F10X_CL
		break;
	case RESUME_OFF:
	case RESUME_ESOF:
	default:
		ResumeS.eState = RESUME_OFF;
		break;
	}
}